Why did the Prophet (peace be upon him) use the word "yajlis" (to sit) in his saying: "If one of you enters the mosque, let him pray two rak'ahs before he sits," even though "yajlis" is said for someone who leans back, and "yaq'ud" (to sit) is for someone who stands?

The aforementioned Hadith (definition) is authentic, and the Prophet, peace and blessings be upon him, used the word "julus" (الجلوس - sitting) and not "qu'ud" (القعود - sitting). Both have the same meaning. "Jalasa" (جلس) means only to sit, whereas "qa'ada" (قعد) can mean to sit or to stand (from the words with opposite meanings). What the Messenger of Allah, peace and blessings be upon him, said is eloquent and precise, and he is the most eloquent of all eloquent speakers.